Be Unsearchable in the "Find Friends" feature

I couldn't find the security feature to allow my account be unsearchable in the "Find Friends" feature at http://wordpress.com/#!/read/find-friends/ that allows users to find other users via their email, Twitter, and Facebook accounts. I tried searching "unsearchable" and "find friends" on Google and these support forums and found nothing. Other than that, I wasn't really sure what else to search.

I would expect that you would have to be using an email for that account which had never emailed your friends, and which had never received email from them. If you are concerned about this, change your email NOW.